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Education
United StatesCanadaTechnical Service 1 800 243-4630 Technical Service 1 800 267-4414 Sales Assistance 1 800 896-4223 Sales Assistance 1 800 265-1840 ext. 6137G122000 Resource GuideHearing ProtectionGEducationHow to Usethe NoiseReductionRating (NRR)The NRR describes the averagesound level reduction (attenuation)provided by a hearing protectiondevice (HPD) in a laboratory the NRR is based onlaboratory testing, it does not takeinto account the loss of protectionthat occurs when hearing protectorsare not fit properly or when they arenot worn for the entire time that thewearer is exposed to noiseFor most wearers, the NRRidentified on the current EPA label(shown here)
Rating (Experimenter Fit) The NRR on the EPA label shown to the right is based on the average amount of attenuation provided by an HPD when it is worn by 10 different people during a laboratory test. During this test, the person conducting the test fits the hearing protector on each person. This “experimenter fit” method results in ratings ...
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